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low frequency meter problem?

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fireplus

fireplus

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hi,

may some body help me in how can i measure low frequency signal such as 50.73hz the most important is 0.73hz with small gate time like 0.2 sec
i made a frequency meter that can measure 500khz to 1 hz with a gate time 1 sec
but what about lower than 1hz frequency ?

Thanks for every body want to help

Fire in The Wire :idea:
 

Hi fireplus!

Use the low frquency signal as the gating pulse along with a clock to measure pulse width. Calibration of this result gives frequency.

Giri
 

hi,
but i still have to waite for more than one second for 0.3hz wave
is there any different alogrithm to do that with small gate time

Fire in The Wire :idea:
 

Do a Google search for "frequency reciprocal counting" and I think you will find your answer.

For a graphical analysis of "zero crossing" versus "reciprocal counting" methods, by Michel Waleczek, you can look here:
https://www.m3electronix.com/recip.gif
 

    fireplus

    fireplus

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I think using a triggered clock and a counter would do
the trick as Giri said. You need to trigger a clock when
the signal croos zero and count thepulses until the
next zero crossing . Ex., using half cycle of a 50 Hz
signal (20 MSec) to trigger a 10Mhz counting clock
will give you 100,000 counts, for a 50.3 Hz signal the
count would be 99,403.
 

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